linux-kernel - Re: 2.6.18 ext3 panic.

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Date:	Tue, 10 Oct 2006 00:40:51 +0200
From:	Jan-Benedict Glaw <jbglaw@...-owl.de>
To:	Eric Sandeen <sandeen@...deen.net>
Cc:	Andrew Morton <akpm@...l.org>, Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	esandeen@...hat.com, Badari Pulavarty <pbadari@...ibm.com>,
	Jan Kara <jack@....cz>
Subject: Re: 2.6.18 ext3 panic.

On Mon, 2006-10-09 14:46:30 -0500, Eric Sandeen <sandeen@...deen.net> wrote:
> Andrew Morton wrote:
> > On Tue, 03 Oct 2006 00:43:01 -0500
> > Eric Sandeen <sandeen@...deen.net> wrote:
> > > Dave Jones wrote:
> > > > So I managed to reproduce it with an 'fsx foo' and a
> > > > 'fsstress -d . -r -n 100000 -p 20 -r'. This time I grabbed it from
> > > > a vanilla 2.6.18 with none of the Fedora patches..
> > > >
> > > > I'll give 2.6.18-git a try next.
> > > >
> > > > ----------- [cut here ] --------- [please bite here ] ---------
> > > > Kernel BUG at fs/buffer.c:2791
> > > I had thought/hoped that this was fixed by Jan's patch at 
> > > http://lkml.org/lkml/2006/9/7/236 from the thread started at 
> > > http://lkml.org/lkml/2006/9/1/149, but it seems maybe not.  Dave hit this bug 
> > > first by going through that new codepath....
> > 
> > Yes, Jan's patch is supposed to fix that !buffer_mapped() assertion.  iirc,
> > Badari was hitting that BUG and was able to confirm that Jan's patch
> > (3998b9301d3d55be8373add22b6bc5e11c1d9b71 in post-2.6.18 mainline) fixed
> > it.
> 
> Looking at some BH traces*, it appears that what Dave hit is a truncate
> racing with a sync...
> 
> truncate ...
>   ext3_invalidate_page
>     journal_invalidatepage
>       journal_unmap buffer
> 
> going off at the same time as
> 
> sync ...
>   journal_dirty_data
>     sync_dirty_buffer
>       submit_bh <-- finds unmapped buffer, boom.

Is this possibly related to the issues that are discussed in another
thread? We're seeing problems while unlinking large files (usually get
it within some hours with 200MB files, but couldn't yet reproduce it
with 20MB.)

MfG, JBG
-- 
      Jan-Benedict Glaw      jbglaw@...-owl.de              +49-172-7608481
Signature of:         Alles wird gut! ...und heute wirds schon ein bißchen besser.
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